Subject:
      This patch fix a bug that occured when courier-IMAP and vpopmail (STABLE 
   version : 5.2.1) are used together (with courier authentication set to
   vchkpw).

Details:
      To authenticate users, courier-IMAP is using vpopmail functions. But these
   functions have not be written for multiple calls (vpopmail has nos daemon,
   authdaemon is a... daemon !).
      The vpopmail function "parse_email" don't initialize its buffers, so next
   calls will returns incorrects results, resulting in hasardous authentication
   problems.

Fix:
      Integrate "parse_email" function of vpopmail 5.3, writing more secure
   (using snprintf), with the function name "parse_email_internal" (and of
   course, modify call).

Notes:
      DON'T USE THIS PATCH IF YOU ARE USING vpopmail > 5.3 !

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